Experimental Research on Converting Biomass Waste into Bio- fertilizer by Hydrothermal Treatment

LI Chuan hua1, QIAN Guang ren1, HONG Rui jin1, WANG Xue mei2, QIU Fu rong3 (1.Research Center of Solid Waste, College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072,China; 2.Department of Environmental Science, Fudan University, Shanghai 200433,China; 3.Analysis Center, Fudan University, Shanghai 200433,China)

hydrothermal treatment; biomass waste; humic acid; bio- fertilizer

Since the conversionn of biomass waste into a new kind of resource has high value added, this study mainly concentrated on how to transform biomass waste( such as bagasses, leaves and vegetable castoffs) into bio- fertilizer by hydrothermal treatment. Through IR analysis for the transforming product, it was found that contained large quantity of humic acids that had high fertilizer efficiency and economic benefits. The influence of temperature, holding time and catalyst on the quality and performance of humic acids produced was also revealed elementarily. Biomass waste degraded and reformed into humic acids with carboxyl, hydroxyl and so on under high pressure and catalyzer. The optimal reaction parameters were temperature:160 ℃ ～ 180 ℃ , holding time:1～ 2 h, catalyzer: Na2CO3. The content of humic acids reached 45% at 160℃ and holding time 1.5 h.The produced humic acids could be used as a high- efficiency fertilizer. Hydrothermal treatment would have a bright market future in biomass waste disposal.